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API Reference

The Vantiq API provide an API for interacting with the Vantiq server. Each API returns a Promise that provides the results or errors from the API call.

This document defines the Vantiq Client SDK. Please refer to the Vantiq Reference Guides for details on the how to use the Vantiq system.

Vantiq API

The Vantiq object provides the main API for the Vantiq NodeJS SDK. This SDK follows the Vantiq REST API resources model.

Resources

Each of the SDK API methods corresponds to a specific REST API operation on a specific resource. For example, select performs a query against a given resource. select('system.types', ...) queries against defined data types. select('procedures', ...) queries against defined procedures.

The available system resources are listed in Vantiq.SYSTEM_RESOURCES and include the following:

Resource Name Type Name Description
analyticsmodels ArsAnalyticsModel Analytical models that can be imported and executed in Vantiq
configurations ArsRuleConfiguration Configurations of Vantiq resources
documents ArsDocument Unstructured documents stored in the Vantiq system
namespaces ArsNamespace Namespaces defined in the Vantiq system
nodes ArsPeerNode Node defined in the Vantiq system to support federation
profiles ArsProfile Vantiq user permission profiles
procedures ArsComponent Procedures defined in the Vantiq system
rules ArsRuleSet Rules defined in the Vantiq system
scalars ArsScalar User-defined property type definitions
sources ArsSource Data sources defined in the Vantiq system
topics ArsTopic User-defined topics in the Vantiq system
types ArsType Data types defined in the Vantiq system
users ArsUser Vantiq user accounts
images ArsImages Images stored in the Vantiq system
videos ArsVideos Videos stored in the Vantiq system

Data types defined in the Vantiq system can also be used as resources. For example, if you define data type MyNewType, then MyNewType is now a legal resource name that can be used in the API methods.

API

Error

Vantiq

The Vantiq constructor creates a new instance of the Vantiq SDK object. The SDK expects that the first operation is to authenticate onto the specified Vantiq server. After successfully authenticated, the client is free to issue any requests to the Vantiq server.

This class exposes the Vantiq REST API. The Vantiq class is provided by the vantiq-sdk NPM module.

Signature

var vantiq = new Vantiq(options)

Option Parameters

Name Type Required Description
server String Yes The Vantiq server URL to connect to, e.g. https://dev.vantiq.com
apiVersion Integer No The version of the API to use. Defaults to the latest.

Returns

An instance of the Vantiq object

Example

var Vantiq = require('vantiq-sdk');

var vantiq = new Vantiq({ server: 'https://dev.vantiq.com' });

Vantiq.authenticate

The authenticate method connects to the Vantiq server with the given authentication credentials used to authorize the user. Upon success, an access token is provided to the client for use in subsequent API calls to the Vantiq server. The username and password credentials are not stored.

Signature

var promise = vantiq.authenticate(username, password)

Parameters

Name Type Required Description
username String Yes The username to provide access to the Vantiq server
password String Yes The password to provide access to the Vantiq server

Returns

The authenticate method returns a promise that resolves if the authentication was successful. Upon any failure, including invalid credentials, the promise is rejected with an error. If the credentials are not valid, the promise rejects with an error that has a HTTP status code of 401.

Example

var promise = vantiq.authenticate('joe@user', 'my-secr3t-passw0rd!#!')
            .then((result) => console.log('Authenticated!'))
            .catch((err)   => console.error(err));

Vantiq.accessToken

The Vantiq accessToken is the token returned during an authenticate call used to maintain authenticated access during the subsequent invocations using this SDK. Typically, the access token is resolved through the authenticate method. However, the token can be explicitly set if the token is already available, such as a long-lived token issued by the Vantiq server.

Signature

// To retrieve the current access token
var accessToken = vantiq.accessToken;

// To set a new access token
vantiq.accessToken = tokenFromServer;

Vantiq.select

The select method issues a query to select all matching records for a given resource.

Signature

var promise = vantiq.select(resource, props, where, sort)

Parameters

Name Type Required Description
resource String Yes The name of the resource type to query.
props Array No Specifies the desired properties to be returned in each record. An empty array or null value means all properties will be returned.
where Object No Specifies constraints to filter the data. Null means all records will be returned.
sort Object No Specifies the desired sort for the result set.

The props is an array of property names indciating which properties should be returned.

The where is an object with supported operations defined in API operations.

The sort is an object with keys that are the properties to sort on and the values indicate ascending (1) or descending (-1).

Returns

The select method returns a promise that resolves to the list of matching records. Upon any failure, the promise is rejected with an error.

Example

Select the name property for all available types.

vantiq.select('system.types', [ 'name' ])
    .then((result) => {
        result.forEach(e => console.log(e.name);
    });

Selects all properties filtering to only return types with the TestType name.

vantiq.select('system.types', [], { name: 'TestType' })
    .then((result) => {
        console.log(JSON.stringify(result[0], null, 2));
    });

Selects all records for the TestType type returning only the key and value properties and sorting the results by the key in descending order.

vantiq.select('TestType', [ 'key', 'value' ], {}, { key: -1 })
    .then((result) => {
        console.log(JSON.stringify(result[0], null, 2));
    });

Vantiq.selectOne

The selectOne method issues a query to return the single record identified by the given identifier.

Signature

var promise = vantiq.selectOne(resouce, id)

Parameters

Name Type Required Description
resource String Yes The resource to query
id String Yes The unique identifier for the record ("_id" for user defined Types)

Returns

The selectOne method returns a promise that resolves to the matching record or null if the record does not exist. Upon any failure, the promise is rejected with an error.

Example

Select the TestType definition from the types resource.

vantiq.selectOne('system.types', 'TestType')
    .then((result) => {
        console.log(JSON.stringify(result, null, 2));
    });

Selects a TestType record with _id equal to 23425231ad31f.

vantiq.selectOne('TestType', '23425231ad31f')
    .then((result) => {
        console.log(JSON.stringify(result, null, 2));
    });

Vantiq.count

The count method is similar to the select method except it returns only the number of records rather than returning the records themselves.

Signature

var promise = vantiq.count(resource, where)

Parameters

Name Type Required Description
resource String Yes The name of the resource to query
where Object No Specifies constraints to filter the data. Null means all records will be returned.

The where is an object with supported operations defined in API operations.

Returns

The count method returns a promise that resolves to the number of matching records. Upon any failure, the promise is rejected with an error.

Example

Counts the number of TestType records.

vantiq.count('TestType')
    .then((result) => {
        console.log("TestType has " + result + " records");
    });

Counts the number of TestType with a value greater than 10.

vantiq.count('TestType', { value: { $gt: 10 }})
    .then((result) => {
        console.log("TestType has " + result + " records with value > 10");
    });

Vantiq.insert

The insert method creates a new record of a given resource.

Signature

var promise = vantiq.insert(resource, object)

Parameters

Name Type Required Description
resource String Yes The name of the resource to insert
object Object Yes The object to insert

Returns

The insert method returns a promise that resolves to the object just inserted.
Upon any failure, the promise is rejected with an error.

Example

Inserts an object of type TestType.

var objToInsert = {
    key: 'SomeKey',
    value: 42
};

vantiq.insert('TestType', objToInsert)
    .then((result) => {
        console.log(JSON.stringify(result, null, 2));
    });

Vantiq.update

The update method updates an existing record of a given resource. This method supports partial updates meaning that only the properties provided are updated. Any properties not specified are not changed in the underlying record.

Signature

var promise = vantiq.update(resource, id, object)

Parameters

Name Type Required Description
resource String Yes The name of the resource to update
id String Yes The unique identifier for the record ("_id" for user defined Types)
props Object Yes The properties to update in the record

Returns

The update method returns a promise that resolves to the object just updated.
Upon any failure, the promise is rejected with an error.

Example

Updates a given TestType record

var _id = '56f4c52120eb8b5dee4898fd';

var propsToUpdate = {
    value: 13
};

vantiq.update('TestType', _id, propsToUpdate)
    .then((result) => {
        console.log(JSON.stringify(result, null, 2));
    });

Vantiq.upsert

The upsert method either creates or updates a record in the database depending if the record already exists. The method tests for existence by looking at the natural keys defined on the resource.

Signature

var promise = vantiq.upsert(resource, object)

Parameters

Name Type Required Description
resource String Yes The name of the resource to upsert
object Object Yes The object to upsert

Returns

The upsert method returns a promise that resolves to the object just inserted or created. Upon any failure, the promise is rejected with an error.

Example

Inserts an object of type TestType.

var objToUpsert = {
    key: 'SomeKey',
    value: 42
};

vantiq.upsert('TestType', objToUpsert)
    .then((result) => {
        console.log(JSON.stringify(result, null, 2));
    });

Vantiq.delete

The delete method removes records from the system for a given resource. Deletes always require a constraint indicating which records to remove.

Signature

var promise = vantiq.delete(resource, where)

Parameters

Name Type Required Description
resource String Yes The name of the resource to remove
where Object Yes Specifies which records to remove

The where is an object with supported operations defined in API operations.

Returns

The remove method returns a promise that resolves when the removal succeeded.
Upon any failure, the promise is rejected with an error.

Example

Removes the record with the given key.

vantiq.delete('TestType', { key: 'SomeKey' })
    .then((result) => {
        console.log("Removed record with 'SomeKey' key.");
    });

Removes all records of TestType with a value greater than 10.

vantiq.delete('TestType', { value: { $gt: 10 }})
    .then((result) => {
        console.log("Removed all records with value > 10");
    });

Vantiq.deleteOne

The deleteOne method removes a single record specified by the given identifier.

Signature

var promise = vantiq.deleteOne(resource, id)

Parameters

Name Type Required Description
resource String Yes The name of the resource to remove
id String Yes The id for the given record

Returns

The deleteOne method returns a promise that resolves to true if the record was removed or false if no record was found. Upon any failure, the promise is rejected with an error.

Example

Removes the TestType definition from the types resource.

vantiq.deleteOne('system.types', 'TestType')
    .then((result) => {
        if(result) {
            console.log("Delete succeeded.");
        }
    });

Removes the TestType record with _id equal to 23425231ad31f.

vantiq.deleteOne('TestType', '23425231ad31f')
    .then((result) => {
        if(result) {
            console.log("Delete succeeded.");
        }
    });

Vantiq.publish

The publish method supports publishing to a topic or a source.

Publishing a message to a given topic allows for rules to be defined that trigger based on the publish event. Topics are slash-delimited strings, such as '/test/topic'. Vantiq reserves /type, /property, /system, and /source as system topic namespaces and should not be published to. The payload is the message to be sent.

Calling publish on a source performs a publish (asynchronous call) on the specified source. The payload is the parameters required to issue the publish operation on the source.

Signature

var promise = vantiq.publish(resource, id, payload)

Parameters

Name Type Required Description
resource String Yes The resource to publish. Must be either 'topics' or 'sources'.
id String Yes The id for the specific resource to use. An example topic is '/test/topic'. An example source is 'mqttChannel'.
payload Object Yes For topics, the payload is the message to send. For sources, this is the parameters for the source.

For sources, the parameters required are source specific and are the same as those required when performing a PUBLISH ... TO SOURCE ... USING params. Please refer to the specific source definition documentation in the Vantiq API Documentation.

Returns

Since the publish operation is an asynchronous action, the returned value is a boolean indicating if the publish occurred successfully. Upon any failure, the promise is rejected with an error.

Example

Send a message onto the /test/topic topic.

var message = {
    key:   'AnotherKey',
    ts:    new Date().toISOString(),
    value: 13
};

vantiq.publish('topics', '/test/topic', message)
    .then((result) => {
        console.log("Published message successfully.");
    });

Send a message to a SMS source mySMSSource.

var params = {
    body: "Nice message to the user",
    to: "+16505551212"
};

vantiq.publish('sources', 'mySMSSource', params)
    .then((result) => {
        console.log("Published message successfully.");
    });

Vantiq.execute

The execute method executes a procedure on the Vantiq server. Procedures can take parameters (i.e. arguments) and produce a result.

Signature

var promise = vantiq.execute(procedure, params)

Parameters

Name Type Required Description
procedure String Yes The name of the procedure to execute
params Object No An object that holds the parameters

The parameters may be provided as an array where the arguments are given in order. Alternatively, the parameters may be provided as an object where the arguments are named.

Returns

The execute method returns a promise that resolves to the returned value from the procedure. Upon any failure, the promise is rejected with an error.

Example

Executes an sum procedure that takes arg1 and arg2 arguments and returns the total using positional arguments.

vantiq.execute('sum', [ 1, 2 ])
    .then((result) => {
        console.log("The sum of 1 + 2 = " + result.total);
    });

Using named arguments.

vantiq.execute('sum', { arg1: 1, arg2: 2 })
    .then((result) => {
        console.log("The sum of 1 + 2 = " + result.total);
    });

Vantiq.query

The query method performs a query (synchronous call) on the specified source. The query can take parameters (i.e. arguments) and produce a result.

Signature

var promise = vantiq.query(source, params)

Parameters

Name Type Required Description
source String Yes The source to perform the query
params Object No An object that holds the parameters

The parameters required are source specific and are the same as those required when performing a SELECT ... FROM SOURCE ... WITH params. Please refer to the specific source definition documentation in the Vantiq API Documentation.

Returns

The query method returns a promise that resolves to the returned value from the source.
Upon any failure, the promise is rejected with an error.

Example

Query a REST source adder that returns the total of the given parameters.

var params = {
    path: '/api/adder',
    method: 'POST',
    contentType: 'application/json',
    body: {
        arg1: 1,
        arg2: 2
    }
};

vantiq.query('sum', params)
    .then((result) => {
        console.log("The sum of 1 + 2 = " + result.total);
    });

Vantiq.subscribe

The subscribe method creates a WebSocket to the Vantiq server and listens for specified events. The provided callback is executed whenever a matching event occurs.

Signature

var promise = vantiq.subscribe(resource, name, [operation,] callback)

Parameters

Name Type Required Description
resource String Yes The resource event to subscribe. Must be either 'topics' or 'sources' or 'types'.
name String Yes The resource name that identifies the specific resource event. For topics, this is the topic name (e.g. '/my/topic/'). For sources, this is the source name. For types, this is the data type name.
operation String No This only applies for 'types' and specifies the operation to listen to (e.g. 'insert', 'update', or 'delete')
callback Function Yes This is the callback that executes whenever a matching event occurs. The signiature is: callback(message).
params Map No Map specifying extra details about the subscription to the server. (eg: {persistent:true} to create a persistent subscription, {persistent:true: subscriptionName: 'mySub', requestId: requestId} to reconnect to a broken persistent subscription)

The message that is provided when an event occurs contains the following:

Name Type Description
status int The HTTP status code associated with the message, usually 100.
contentType String The content type for the body of the message. Typically, this is application/json.
headers Object The headers associated with the event. The X-Request-Id header will be based on the resource path for the event.
body Object The content of the event.

The structure of the body of the event is:

Name Type Description
path String The full event path
value Object The payload of the event.

Returns

The subscribe method returns a promise that resolves when the subscription has successfully connected. Upon any failure, the promise is rejected with an error.

Example

Create a subscription to the /test/topic topic that prints out when events are published to the topic.

function callback(message) {
    console.log("Received message at " + new Date());
    console.log("Event Payload = " + JSON.stringify(message.body.value, null, 2));
}

vantiq.subscribe('topics', '/test/topic', callback)
    .then(() => {
        console.log("Subscription succeeded.");
    });

Create a subscription to the MySource source that prints out when messages arrive at the source.

function callback(message) {
    console.log("Received message at " + new Date());
    console.log("Source Message = " + JSON.stringify(message.body.value, null, 2));
}

vantiq.subscribe('sources', 'MySource', callback)
    .then(() => {
        console.log("Subscription succeeded.");
    });

Create a subscription to the MyDataType type for that prints out when that type has been updated.

function callback(message) {
    console.log("Received message at " + new Date());
    console.log("Updated Value = " + JSON.stringify(message.body.value, null, 2));
}

vantiq.subscribe('types', 'MyDataType', 'update', callback)
    .then(() => {
        console.log("Subscription succeeded.");
    });

See Vantiq.acknowledge section for how to make a persistent subscription to a reliable resource

Vantiq.unsubscribeAll

The unsubscribeAll method removes all active subscriptions to the Vantiq server by closing the WebSocket.

Signature

void vantiq.unsubscribeAll()

Parameters

N/A

Returns

N/A

Example

vantiq.unsubscribeAll();

Vantiq.upload

The upload method performs a upload of a file into an ArsDocument resource.

Signature

var promise = vantiq.upload(file, contentType, documentPath)

Parameters

Name Type Required Description
file File Yes The full path to the file to be uploaded
contentType String Yes The MIME type of the uploaded file (e.g. "image/jpeg")
String documentPath Yes The "path" of the ArsDocument in Vantiq (e.g. "assets/myDocument.txt")
String resourcePath No The "path" of the Vantiq resource that the file will be uploaded to (e.g. "/resources/documents", "/resources/images/", or "/resources/videos")

Returns

The upload method returns a promiise that resolves to the ArsDocument object containing information about the uploaded file. In particular, the response will contain:

Name Type Description
name String The document path (e.g. "assets/myDocument.txt")
fileType String The MIME type of the uploaded file (e.g. "image/jpeg")
content String This provides the URI path to download the content. This is used in the download method.

Example

The following uploads a text file and prints out the resulting ArsDocument:

var file = '/path/to/file/myFile.txt';
vantiq.upload(file, 'text/plain', 'assets/myFile.txt')
    .then((result) => {
        console.log(JSON.stringify(result, null, 2));
    });

The following example uploads an image and prints out the resulting ArsImage:

var file = '/path/to/file/myImage.png';
vantiq.upload(file, 'image/png', 'assets/myImage.png', '/resources/images')
    .then((result) => {
        console.log(JSON.stringify(result, null, 2));
    });

Vantiq.download

The download method pulls down the content of the specified file that was previously uploaded. The result is streamed to the client.

Signature

var promise = vantiq.download(path)

Parameters

Name Type Required Description
path String Yes This is the path of the file and is specified in the content field in the ArsDocument associated with the file in Vantiq.

Returns

The download returns a promise that resolves to the HTTP response object that implements the Readable stream API.

Example

Downloads the file and prints the contents to the console:

vantiq.download('/docs/assets/myFile.txt')
    .then((resp) => {
        console.log('Content-Type: ' + resp.headers['content-type']);
        resp.on('data', (chunk) => { console.log(chunk.toString()); });
        resp.on('error',  (err) => { console.error(err); });
    });

Downloads the file and streams the contents to a newly created file:

vantiq.download('/docs/assets/myFile.txt')
    .then((resp) => {
        var writer = fs.createWriteStream('myFile.txt');
        resp.pipe(writer);
    });

Error

The REST API provides both an HTTP status code and an error object which is returned through the SDK when an error is encountered. The SDK returns errors in the following form:

{
    statusCode: <HTTPStatusCode>,
    body: [
        {
            code: <ErrorIdentifier>,
            message: <ErrorMessage>,
            params: [ <ErrorParameter>, ... ]
        },
        ...
    ]
}

Parameters

Name Type Description
statusCode Number The HTTP status code in the response.
body Array<Object> The array of all errors that occurred during the SDK REST call.
body.code String The Vantiq error id (e.g. "io.vantiq.authentication.failed")
body.message String The human readable message associated with the error
body.params Array<Object> An array of arguments associated with the error

Example

To catch if the user was not authorized using the HTTP status code.

vantiq.authenticate('joe@user', 'my-secr3t-passw0rd!#!')
        .catch((err)   => {
            if(err.statusCode == 401) {
                console.log('User not authorized');
            } else {
                console.error(err)
            }
        });

To catch if a select against an unknown type.

vantiq.select('BadType')
        .catch((err)   => {
            if(err.code === 'com.accessg2.ag2rs.type.not.found') {
                console.log('Invalid type: ' + err.params[0]);
            } else {
                console.error(err)
            }
        });

Vantiq.acknowledge

The acknowledge method is used to acknowledge the receipt of messages from reliable resources after creating a persistent subscription. The provided callback is executed whenever a matching event occurs.

Signature

void vantiq.acknowledge(subscriptionName, requestId, msg)

Parameters

Name Type Required Description
subscriptionName String Yes The name of the subscription that uniquely identifies the persistent subscription. This was returned by the server on creation of the persistent subscription.
requestId String Yes The id of the requestId that that uniquely identifies the websocket requests made by this subscription. This was returned by the server on creation of the persistent subscription.
msg Object Yes The message in the event being acknowledged. This is the body of the SubscriptionMessage

Returns

N/A

Example

Create a persistent subscription to the /test/topic reliable topic that acknowledges when events are published to the topic.

v.subscribe('topics', '/reliableTopic',  {persistent: true}, (r) => {
                //Server response with subscription information (not a topic event)
                if (r.body.subscriptionName !== undefined) {
                    subscriptionName = r.body.subscriptionName;
                } else {
                    //message.body is an event on the subscribed topic. Acknowledge that we received the event
                    vantiq.acknowledge(subscriptionName, "/topics/reliableTopic", resp.body);
                }

Create a subscription to the MySource reliable source that prints out when messages arrive at the source.

v.subscribe('sources', 'myReliableSource',  {persistent: true}, (r) => {
                //Server response with subscription information (not a topic event)
                if (r.body.subscriptionName !== undefined) {
                    subscriptionName = r.body.subscriptionName;
                } else {
                    //message.body is an event on the subscribed topic. Acknowledge that we received the event
                    vantiq.acknowledge(subscriptionName, "/topics/reliableTopic/ack", resp.body);
                }

To reconnect to a severed persistent subscription.

v.subscribe('topics', '/reliableTopic',  {persistent: true, subscriptionName: subscriptionName, requestId: '/topics/reliableTopic'}, (r) => {
    //Server response with subscription information (not a topic event)
    if (r.body.subscriptionName !== undefined) {
        subscriptionName = r.body.subscriptionName;
    } else {
        //message.body is an event on the subscribed topic. Acknowledge that we received the event
        vantiq.acknowledge(subscriptionName, "/topics/reliableTopic/ack", resp.body);
    }